Pen



FIG. 1 is a right side elevational view of a pen showing my new design;

FIG. 2 is a front elevational view;

FIG. 3 is a top plan view of the clip;

FIG. 4 is a plan view of the bottom end;

FIG. 5 is a rear elevational view of the pen;

FIG. 6 is a right side elevational view of the pen with the cap deposed on the end remote from the writing tip;

FIG. 7 is a front elevational view thereof; and

FIG. 8 is a rear elevational view thereof. 

The ornamental design for a pen, as shown and described. 